Either
1.Lift every single key which has problems and clean(no water) underneath it
2.on my very outofdate toshiba- there is a cliky thing somewhere- which realeases the entire keyboard(this doesnt help for individual keys)
3.Worst case Scenario - Somebody spilt water&#092;coffee&#092;beer etc on it -open the keys and dry up fast, if its beer&#092;sugar liquid use wet cloth then let it dry for a long while.

With an external keyboard its not a problem to wash it - but laptops its fkd.....so if its only a few keys and you have warranty bring it back

In the meantime-(unless you dont find solution)
-There is an OnScreen Keyboard you can use in the meantime - go to Start-Programs-Accesories-Accesabitlity-Keyboard
-You can connect an external keyboard